Lathe tool-holder.



B. T. BROWAND.

LATHE TOOL HOLDER.

AFFLlCA ION FILED NOV. 12. 1917.

Patented Oct. 15, 1918.

2 SHEETSSHEET 1 avmmwtoz B. TEEDWAJYD.

Mia/mm B. T. BROWAND.

LATHE TOOL HOLDER.

APPLICATION FILED NOV. 12, 1912.

2 SHEETS-SHEE :F SMAWA/HIOZ .E. TEEUWAN BENJAMIN T. BROWAND, OF CLEVELAND, OHIO.

LATHE TOOL-HOLDER.

1,281,761. Specification of L tter Patent Patented Oct. 15, 1918.

Application filed November 12, 1917.v Serial No. 201,450.

To all whom. i2. may concern:

Be it known that I BENJAMIN T. BRow- AND, citizen of the United States, residing at Cleveland, in the county of ,(Juyahoga and State of Ohio, have invented certain new and useful Improvements in Lathe Tool-Holders, of which the following is a specification.

This invention pertains to a lathe toolholder constructed and adapted to operate substantially as shown and described and particularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a sectional elevation of the holder, and

Fig. 2 is a plan view on section line 22, Fig. 1. Fig. 3 is a side elevation of the complete holder and tools therein as in Fig. 1.

Fig. 4 is a detail of the central fastening screw. Fig. 5 is a longitudinal section of the supporting arm, and Fig. 6 is a detail of the pawl shown in engaging relations in Fig. 2, and Fig. 7 is-a detail of the spring behind said pawl. Fig. 8 is a perspective view of the tool carrying member and Fig. 9 is a side elevation of the same. Fig. 10 is a sectional view of the supporting arm, showing the locking bolt for the pawl-engaging set screw.

As thus shown the complete article of manufacture and sale comprises a supporting arm a provided with a circular flanged head 2 providing a seat for the tool carrying member h open at one side and closed at the back thereof and provided with a recess 3 in the base of said arm open into said seat and adapted to receive a pawl 4 and spring 5, as seen in Fig. 2.

The sa1d tool supporting or carrying member it has radial slots, channels or grooves 6 in its face and open across the said face, and is provided with an integral hub 7 on the back of the body thereof and adapted to seat rotatably in the head 2, and the said hub has a screw threaded bore in its center engaged by the screw 8 entered through a central hole in head 2 and by which the tool supporting member or holder h is supported in working position. The said hub has ratchet notches or recesses 10 at fixed intervals in its side, the same being incident in position and number to the tool supporting slots 6 and adapted to serve with the pawl 4 as positive stops or abutments for the tool holding head it when in use but also having outwardly inclined back surfaces which permit the said head and hub to be rotated in respect to said pawl by depressing the same through said inclined surface and against its spring 5 to b-rlng any given tool in any one of the several slots (5 into cutting position. Otherwise, and as shown in Fig. 2, the said pawl provldes a positive stop for the holder h, and rotation of the said holder to change tools is made possible by this construction without separating or removing any of the arts, and by merely rotating the said 1101 er 7, say a quarter turn.

But in addition to the foregoing I have provided means for so relating the tool to the work that I can vary the cutting position thereof through the position of the pawl 1 in its recess to get a raking effect. It will be noticed that the said recess is somewhat widened at its top and front as compared with its inner portion and that the pawl is relatively narrower than the recess and has a certain limit of play therein under control of the set screw 12, which bears against the back of said pawl and fixes the limit of its movement. For example, suppose the tool 14 tobe positioned as seen in Fig. 3 in exact axial alinement with arm a and it is desired to give the tool more or less bite. The screw 12 is then adjusted inward or outward accordingly, and if projected inward to the maximum the said pawl will be locked down and the position of the tool will be affected accordingly. Modification from this position is obtained by proportionately withdrawing the screw. In either or any position the said screw is locked by means seen in Fig. 10, in which the locking bolt 17 has a half round recess 19 engaging the screw and a nut 20 adapted to tighten the same on the screw and lock it against possible loosening.

The several tools 14 are held in working osition in the slots or channels 6 by means of disk shapedwashers or clamps 15 partially overlapping the same and clamping screw 16' engaging the washers therewith. The said screws enter at the sides of the said slots and in such'relation that the washer 15 will partially overlap the slot and of course bear on the tool with a clamping effect, and each tool has its own independent fastening means. The said clamping washers are seated over correspondingly shaped cavities or depressions 18 in the face of the body It at the sides of the slots 6 and running into the same in about the same measure as the said washers or clamps overlap the slot and tool, so that in any event, even though the shanks of the tools have not the depth of said slots, the clamps or Washers will still bear on the tool while the clamps themselves are accommodated in the said cavities. The holes for the screws 16 are nearest to the particular slot and tool with which they are in clamping relation. The said clamping disks or plates come directly within the heads of the clamping screws 16 and the said screws penetrate the hub 7 more or less as shown, while the supporting screw 8 also penetrates said hub but stops short of the slots 6 transversely across the face of said member and cross at the middle thereof.

The clamping screw and Washer vmay be placed on either side of the tool slot 6, or a single washer of large diameter may be used to overlap two adjacent tools.

\Vhat I claim 1s:

1. A tool holder for .lathe s having an arm with a flanged seat atone end and a recess open to said seat, a spring pressed pawl in said recess of less width than said recess and a set screw projected into said recess and adapted to bear upon said pawl to depress to said seat, a tool holding member having a hub in said seat having ratchet notches in its side adapted to register with said recess, a pawl in said recess with lateral play therein and adapted to engage in said notches, an adjustable set screw adapted to bear against said pawl, and a lock for said screw entered through the base of said arm.

3. A lathe tool holder, comprising an arm, having an annular seat and a recess open thereto, a ratchet member rotatably secured in said seat and a pawl in said recess of width than the recess and adapted to limit the rotation of said member, a backing screw for said pawl, and means to lock said screw in variable adjusted positions.

Signed at Cleveland, in the county of Cuyahoga, and State of Ohio, this 9th day of N ovember, 1917. p

BENJAMIN T. BROWAND.

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